题目内容
说明两侧对称的出现对动物演化的意义。
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说明中胚层的出现对动物演化的意义。
简述华枝睾吸虫的生活史
Duringthelastfewdecadestherehasbeenasignificantchangeineating______intheUK.Sincetheearly1980seatingoutinrestaurantsandcafeshasincreasedsteadily.Thereareseveralreasonsforthistrend.50yearsagomostwomenwere______andcookedfortheirfamilieseveryday.Butrecently,withmorewomenworkingoutsidetheirhome,lesstimehasbeen_____forfoodpreparation.Currently,71%ofwomenaged20-45areatwork,andby2015itisestimatedthatthiswillriseto84%.Anotherfactoristhegrowthin_____whichhasrisensignificantlysincethelate1970s.Withmoremoneyintheirpocketspeoplearemorelikelyto_______thetroublesofshoppingandcookingbyvisitingtheirlocalrestaurants.
烟尘具有一定的粘附性有利于细尘粒凝聚，从而有利于收尘，但粘附性过强会使收尘率下降。
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